Record the three #827 forks (client-side regroup transport, computed letter→event
link reusing timeline_event_documents, filter-then-group composition with #780)
as ADR-045, trace REQ-001..019 (+005b) into the RTM as Done, and list the new
timeline components in the frontend domain inventory.
Refs #827
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
